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onsemi MOC3073SM — Optoisolators
onsemi

MOC3073SM onsemi Optoisolator Triac Output 4170 Vrms

MPNMOC3073SM
End of Life

onsemi MOC3073SM, random-phase triac output optoisolator, 1-channel, 4170 Vrms isolation, 800 V off-state, 6-SMD gull-wing package, tube, -40 to 85 °C

$1.68Ref. price · indicative, final on quote
MOC3073SM datasheet
Packaging6-SMD, Gull Wing
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

MOC3073SM Technical Specifications
ParameterValue
Output typeTriac
Mounting typeSurface Mount
Voltage - isolation4170Vrms
Voltage - off state800 V
Voltage - forward (Vf)1.18V
Current - hold540µA (Typ)
Current - DC forward (If)60 mA
Current - LED trigger (Ift)6mA
Operating temperature-40°C ~ 85°C
Approval agencyUL
PackageTube
Case6-SMD, Gull Wing
Number of channels1
Static dV (dt)1kV/µs
Zero crossing circuitNo

Product details

Random-phase triac driver for AC load switching

The MOC3073SM is an onsemi random-phase (non-zero-crossing) triac output optoisolator. It drives a triac or SCR in the AC power path, firing at any point in the mains cycle — the phase angle is set by the LED trigger current, not by a zero-cross detect circuit. Rated for 4170 Vrms isolation between the logic-side LED and the output triac, it suits line-voltage applications up to 800 V off-state. The 1 kV/µs minimum static dV/dt keeps the output from false-triggering on fast line transients or inductive kickback. Operating temperature spans -40 to 85 °C, covering outdoor telecom cabinets, factory-floor motor starters, and HVAC damper controls without a temperature derate.

Trigger current and hold current margins

Maximum LED trigger current (Ift) is 6 mA. Typical hold current (Ih) is 540 µA. Forward voltage (Vf) is 1.18 V typical, and the LED can handle up to 60 mA continuous DC forward current, giving headroom for higher drive to reduce trigger delay in phase-angle applications.

Frequently asked questions

Is MOC3073SM zero crossing or random phase?

Random phase — it has no zero-crossing circuit. The triac fires at whatever phase angle the LED trigger current is applied, making it suitable for phase-control dimmers, soft-start circuits, and universal-motor speed controls.